Geologic map of the El Casco quadrangle, Riverside County, California [cartographic material] / by Thomas W. Dibblee, Jr. ; edited by John A. Minch.
Relief shown by contours and spot heights. "Topographic base map from newest available USGS 7.5-minute quadrangle EL CASCO, CA 1967, AMS 2551 I NE - Series V895." "First printing, December 2003." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology.
- Santa Barbara Museum of Natural History
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